CN107317497A - Improve the modulator approach of bridge-type Modular multilevel converter output level number - Google Patents
Improve the modulator approach of bridge-type Modular multilevel converter output level number Download PDFInfo
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- CN107317497A CN107317497A CN201710495960.3A CN201710495960A CN107317497A CN 107317497 A CN107317497 A CN 107317497A CN 201710495960 A CN201710495960 A CN 201710495960A CN 107317497 A CN107317497 A CN 107317497A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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Abstract
Bridge-type Modular multilevel converter (full bridge modular multilevel converter are improved the invention discloses one kind, abbreviation FBMMC) output level number modulator approach, FBMMC every phase upper and lower bridge arm is all made up of bridge-type full voltage submodule and bridge-type half voltage submodule, both submodules are carried out with appropriate switching so that the exchange of FBMMC exchange outputs is surveyed level number and increased.The present invention improves exchange output level number, significantly improves the effect of nearest level approximatioss, significantly reduces the harmonic content of FBMMC output voltages.Moreover, the present invention will not cause the problems such as submodule capacitor voltage skew, bridge arm inductive drop spike, FBMMC DC voltages are fluctuated.
Description
【Technical field】
The invention belongs to field of power electronics, it is related to a kind of raising bridge-type Modular multilevel converter output level number
Modulator approach.
【Background technology】
Modular multilevel converter has the circuit of high modularization, is easy to implement Integration Design, shortens project week
It is phase, cost-effective, it is with a wide range of applications.
In order to realize many level outputs of AC, it is necessary to use specific modulator approach.Modular multilevel converter
Modulation system has critical influence to its performance.Current existing modulation technique is broadly divided into two classes：Multi-carrier PWM is modulated
Technology and nearest multilevel modulation technique.When number of modules is relatively low generally using the higher PWM modulation technology of switching frequency, switch frequency
Rate is too high to mean that switching loss is excessive, and level modulation strategy can not only reduce the switch frequency of power electronic devices recently
Rate and switching loss, and realize that simple, dynamic response is very fast.If but using nearest multilevel modulation technique when level number is relatively low
Then output waveform harmonic content is high, and waveform is poor.
The document for improving nearest level modulation existing at present is as follows：
[1]Lin L,Lin Y,He Z,et al.Improved Nearest-Level Modulation for a
Modular Multilevel Converter With a Lower SubmoduleNumber[J].IEEE
Transactions on Power Electronics,2016,31(8):5369-5377.
[2]Hu P,Jiang D.A Level-Increased Nearest Level Modulation Method for
Modular Multilevel Converters[J].IEEE Transactions on Power Electronics,2015,
30(4):1836-1842.
Document [1] makes the modulation waveform phase of upper and lower bridge arm different to carry with [2] in the case where not changing number of modules
The method of the output level number of high modulation ripple, but this method can cause the average value of submodule voltage relatively low, and capacitance voltage ripple
Dynamic larger, bridge arm inductive drop fluctuates larger, the problems such as DC bus-bar voltage is fluctuated.Therefore need more to be suitably modified measure
In the case where not influenceing voltage fluctuation of capacitor to improving output level number.
【The content of the invention】
In view of the above-mentioned problems, the present invention proposes a kind of raising bridge-type Modular multilevel converter output level number
Modulator approach, by the improvement to topological sum modulation strategy, improves output waveform quality.
The present invention uses following technical scheme：
A kind of modulator approach for improving bridge-type Modular multilevel converter output level number, it is characterised in that：Full-bridge
Every phase upper and lower bridge arm of type Modular multilevel converter is by N number of (N is even number) bridge-type full voltage submodule and 1 full-bridge
Type half voltage submodule is constituted, and described bridge-type full voltage submodule and bridge-type half voltage submodule needs the quantity of switching
Calculated according to following methods：
WhenDuring for odd number, upper and lower bridge arm respectively puts into 1 bridge-type half voltage submodule, it is necessary to which what is put into is complete
The quantity of bridge type full voltage submodule is calculated and obtained according to below equation：
In formula,
Wherein, ndown represents lower bridge arm input bridge-type full voltage submodule quantity, and nup represents that bridge arm puts into full-bridge
Type full voltage submodule quantity, Us represents the modulated signal of a phase, and Uc represents the specified electricity of bridge-type full voltage submodule electric capacity
Pressure, N represents the number of bridge-type full voltage submodule in a bridge arm, and round () represents bracket function；
Iarm represents the bridge arm current, and uh represents the actual capacitance voltage of bridge-type half voltage submodule, and uhref represents complete
The capacitance voltage rated value of bridge type half voltage submodule,
WhenDuring for even number, bridge-type half voltage submodule, the bridge-type full voltage submodule of input are not put into
Quantity is calculated and obtained according to below equation：
Further, whenDuring for odd number, work as ck=1, the mode of operation of bridge-type half voltage submodule is
PLUS, i.e. forward conduction, work as ck=-1, the mode of operation of bridge-type half voltage submodule is MINUS, i.e. reverse-conducting.
Further, the bridge-type full voltage submodule and bridge-type half voltage submodule of the switching per phase upper and lower bridge arm are calculated
Number when, first by modulated signal it is discrete be staircase waveform, the ladder height of staircase waveform isCalculate every according to this staircase waveform
The bridge-type full voltage submodule of the switching of phase upper and lower bridge arm and the number of bridge-type half voltage submodule, wherein, Udc is direct current
Busbar voltage.
Further, full voltage submodule and half voltage submodule are all full bridge structure.
Further, the electric capacity rated voltage of bridge-type full voltage submodule isThe electric capacity of bridge-type half voltage submodule
Rated voltage is
Compared with prior art, the present invention at least has the advantages that：Bridge-type is improved the invention discloses one kind
The modulator approach of Modular multilevel converter output level number, FBMMC every phase upper and lower bridge arm is all by bridge-type full voltage
Module and bridge-type half voltage submodule are constituted, and both submodules are carried out with appropriate switching so that FBMMC exchange outputs
Exchange is surveyed level number and increased.The present invention improves exchange output level number, significantly improves the effect of nearest level approximatioss, significantly
Reduce the harmonic content of FBMMC output voltages.Moreover, the present invention will not cause submodule capacitor voltage skew, bridge arm inductance
The problems such as due to voltage spikes, FBMMC DC voltages are fluctuated.
【Brief description of the drawings】
Fig. 1 is new topological converter structure schematic diagram proposed by the present invention；
Fig. 2 is FBFVSM topological structure；
Fig. 3 is FBHVSM topological structure；
Fig. 4 is the modulation effect contrast simulation of new modulation strategy proposed by the present invention and the nearest level modulation strategy of tradition
Figure (with 4 FBFVSM, exemplified by 1 FBHVSM)；
Fig. 5 is that level modulation strategy FBMMC exports a phase voltage waveform recently using tradition；
Fig. 6 is to export a phase voltage waveform using the new type of modulation strategy FBMMC of the present invention；
Fig. 7 is to use the nearest level modulation strategy bridge arm inductive drop wave pattern of improvement in document [1]；
Fig. 8 is the bridge arm inductive drop wave pattern using modulator approach of the present invention；
Fig. 9 is the submodule capacitor voltage wave pattern using modulator approach of the present invention.
【Embodiment】
One kind improves bridge-type Modular multilevel converter (full bridgemodular multilevel
Converter, abbreviation FBMMC) output level number mixed topology modulator approach, FBMMC every phase upper and lower bridge arm is all by N number of complete
Bridge type full voltage submodule (full bridge full voltage sub module, abbreviation FBFVSM) and 1 bridge-type half
Voltage submodule (full bridge half voltage sub module, abbreviation FBHVSM) is constituted, to both submodules
Carry out appropriate switching so that the ladder height of the staircase waveform of FBMMC exchange outputs is changed into original half, so that FBMMC
AC output level number improved by N+1 to 2N+1.The present invention will not cause submodule capacitor voltage skew, bridge arm inductance electricity
The problems such as pointing peak, FBMMC DC voltages are fluctuated.
It is as follows that the present invention implements step：
(1) upper and lower bridge arm is constituted by N number of FBFVSM and 1 FBHVSM；
(2) modulation strategy is：Modulated signal it is discrete be staircase waveform, the ladder height of staircase waveform isAccording to this ladder
Ripple, calculates the FBFVSM and FBHVSM of the switching of every phase upper and lower bridge arm number.It is last that FBFVSM is produced by balance of voltage strategy
With FBHVSM trigger signal, exported accordingly so that FBMMC is produced.Udc is DC bus-bar voltage.
Wherein, FBFVSM and FBHVSM are full bridge structure.The rated voltage of FBFVSM electric capacity isFBHVSM electricity
The rated voltage of appearance is
Calculate the FBFVSM and FBHVSM of the switching per phase upper and lower bridge arm number detailed step for (be statement simplicity,
By taking a phase as an example)：
(1) whenDuring for odd number, upper and lower bridge arm respectively puts into a FBHVSM, and (FBHVSM incidence is by ck
Value is determined), the FBFVSM numbers of input are：
In formula,
Wherein, ndown represents lower bridge arm input FBFVSM quantity, and nup represents that bridge arm puts into FBFVSM quantity, and Us is represented
The modulated signal of one phase, Uc represents the rated voltage of FBFVSM electric capacity, and N represents the number of FBFVSM in a bridge arm, round
() represents bracket function.
Work as ck=1, FBHVSM mode of operation is PLUS, i.e. forward conduction, works as ck=-1, FBHVSM mode of operation is
MINUS, i.e. reverse-conducting.Iarm represents the bridge arm current.Uh represents FBHVSM actual capacitance voltage, and uhref is represented
FBHVSM capacitance voltage rated value,
(2) whenDuring for even number, bridge-type half voltage submodule, the FBFVSM of upper and lower bridge arm input are not put into
Quantity be：
FBHVSM can be realized by way of increasing new module, in the case where topology is difficult change, can also be led to
Software set is crossed, original FBFVSM is set to FBHVSM, so as to realize this method.
The present invention will not cause submodule capacitor voltage skew, the fluctuation of bridge arm inductive drop spike, FBMMC DC voltages
The problems such as.
It is concise for statement, below with a phase, exemplified by N=18.It is noted that the present invention is when three-phase or N take other even numbers,
It is all suitable for.
Fig. 1 is topological for the FBMMC transverters of the present invention.Each bridge arm is made up of N number of FBFVSM and 1 FBHVSM.
Fig. 2 and Fig. 3 are respectively FBFVSM and FBHVSM structure chart, and FBHVSM electric capacity rated voltage is FBFVSM electric capacity
The half of rated voltage.
Fig. 4 is the modulation principle comparison diagram of new modulation strategy proposed by the present invention and the nearest level modulation strategy of tradition
(by taking 4 FBFVSM as an example).
From Fig. 5 and Fig. 6 contrast as can be seen that the present invention increases FBMMC output level number, improve modulation effect,
Reduce output harmonic wave.
Fig. 7 and Fig. 8 is respectively the bridge arm inductive drop ripple using the method for document [1] and the new type of modulation strategy of the present invention
Shape figure.It can be seen that, the voltage pulsation of the invention made on bridge arm inductance and due to voltage spikes are obviously reduced.
The present invention can make FBFVSM and FBHVSM capacitance voltage to be stable in its rated value attached as can be seen from Figure 9
Closely.Demonstrate the feasibility of the present invention.
Claims (5)
1. a kind of modulator approach for improving bridge-type Modular multilevel converter output level number, it is characterised in that：Bridge-type
Every phase upper and lower bridge arm of Modular multilevel converter is by N number of bridge-type full voltage submodule and 1 bridge-type half voltage
Module composition, N is even number, and described bridge-type full voltage submodule and bridge-type half voltage submodule needs the quantity root of switching
Calculated according to following methods：
WhenDuring for odd number, upper and lower bridge arm respectively puts into 1 bridge-type half voltage submodule, it is necessary to the bridge-type of input
The quantity of full voltage submodule is calculated and obtained according to below equation：
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Wherein, ndown represents lower bridge arm input bridge-type full voltage submodule quantity, and nup represents that bridge arm input bridge-type is complete
Voltage submodule quantity, Us represents the modulated signal of a phase, and Uc represents the rated voltage of bridge-type full voltage submodule electric capacity, N
The number of bridge-type full voltage submodule in a bridge arm is represented, round () represents bracket function；
Iarm represents the bridge arm current, and uh represents the actual capacitance voltage of bridge-type half voltage submodule, and uhref represents bridge-type
The capacitance voltage rated value of half voltage submodule,
WhenDuring for even number, bridge-type half voltage submodule, the bridge-type full voltage submodule quantity of input are not put into
Calculated and obtained according to below equation：
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2. a kind of modulation methods for improving bridge-type Modular multilevel converter output level number according to claim 1
Method, it is characterised in that：WhenDuring for odd number, work as ck=1, the mode of operation of bridge-type half voltage submodule is PLUS,
I.e. forward conduction, works as ck=-1, the mode of operation of bridge-type half voltage submodule is MINUS, i.e. reverse-conducting.
3. a kind of modulation methods for improving bridge-type Modular multilevel converter output level number according to claim 1
Method, it is characterised in that：Calculate the bridge-type full voltage submodule and bridge-type half voltage submodule of the switching per phase upper and lower bridge arm
Number when, first by modulated signal it is discrete be staircase waveform, the ladder height of staircase waveform isCalculate every according to this staircase waveform
The bridge-type full voltage submodule of the switching of phase upper and lower bridge arm and the number of bridge-type half voltage submodule, wherein, Udc is direct current
Busbar voltage.
4. a kind of modulation methods for improving bridge-type Modular multilevel converter output level number according to claim 1
Method, it is characterised in that：Full voltage submodule and half voltage submodule are all full bridge structure.
5. a kind of modulation methods for improving bridge-type Modular multilevel converter output level number according to claim 1
Method, it is characterised in that：The electric capacity rated voltage of bridge-type full voltage submodule isThe electric capacity volume of bridge-type half voltage submodule
Determining voltage is
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| CN111211675A (en) * | 2020-02-24 | 2020-05-29 | 全球能源互联网研究院有限公司 | Submodule redundancy configuration method and system of modular multilevel converter |
| CN111756264A (en) * | 2020-07-02 | 2020-10-09 | 华北电力大学（保定） | Recent half-level approximation PWM hybrid modulation method suitable for medium-voltage three-phase MMC |
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| CN111756264B (en) * | 2020-07-02 | 2023-06-06 | 华北电力大学（保定） | Nearest half-level approximation PWM (pulse-Width modulation) hybrid modulation method suitable for medium-voltage three-phase MMC (modular multilevel converter) |
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